The Tor Browser: media/mtransport/transportlayerprsock.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim: set ts=2 et sw=2 tw=80: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     5  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 // Original author: ekr@rtfm.com

     9 #include "logging.h"

    10 #include "nspr.h"

    11 #include "prerror.h"

    12 #include "prio.h"

    14 #include "nsCOMPtr.h"

    15 #include "nsASocketHandler.h"

    16 #include "nsISocketTransportService.h"

    17 #include "nsNetCID.h"

    18 #include "nsServiceManagerUtils.h"

    19 #include "nsXPCOM.h"

    21 #include "transportflow.h"

    22 #include "transportlayerprsock.h"

    24 namespace mozilla {

    26 MOZ_MTLOG_MODULE("mtransport")

    28 nsresult TransportLayerPrsock::InitInternal() {

    29   // Get the transport service as a transport service

    30   nsresult rv;

    31   stservice_ = do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID, &rv);

    33   if (!NS_SUCCEEDED(rv)) {

    34     MOZ_MTLOG(ML_ERROR, "Couldn't get socket transport service");

    35     return rv;

    36   }

    38   return NS_OK;

    39 }

    41 void TransportLayerPrsock::Import(PRFileDesc *fd, nsresult *result) {

    42   if (state_ != TS_INIT) {

    43     *result = NS_ERROR_NOT_INITIALIZED;

    44     return;

    45   }

    47   MOZ_MTLOG(ML_DEBUG, LAYER_INFO << "Importing()");

    48   fd_ = fd;

    49   handler_ = new SocketHandler(this, fd);

    51   nsresult rv = stservice_->AttachSocket(fd_, handler_);

    52   if (!NS_SUCCEEDED(rv)) {

    53     *result = rv;

    54     return;

    55   }

    57   TL_SET_STATE(TS_OPEN);

    59   *result = NS_OK;

    60 }

    62 int TransportLayerPrsock::SendPacket(const unsigned char *data, size_t len) {

    63   MOZ_MTLOG(ML_DEBUG, LAYER_INFO << "SendPacket(" << len << ")");

    64   if (state_ != TS_OPEN) {

    65     MOZ_MTLOG(ML_DEBUG, LAYER_INFO << "Can't send packet on closed interface");

    66     return TE_INTERNAL;

    67   }

    69   int32_t status;

    70   status = PR_Write(fd_, data, len);

    71   if (status >= 0) {

    72     MOZ_MTLOG(ML_DEBUG, LAYER_INFO << "Wrote " << len << " bytes");

    73     return status;

    74   }

    76   PRErrorCode err = PR_GetError();

    77   if (err == PR_WOULD_BLOCK_ERROR) {

    78     MOZ_MTLOG(ML_DEBUG, LAYER_INFO << "Write blocked");

    79     return TE_WOULDBLOCK;

    80   }

    83   MOZ_MTLOG(ML_DEBUG, LAYER_INFO << "Write error; channel closed");

    84   TL_SET_STATE(TS_ERROR);

    85   return TE_ERROR;

    86 }

    88 void TransportLayerPrsock::OnSocketReady(PRFileDesc *fd, int16_t outflags) {

    89   if (!(outflags & PR_POLL_READ)) {

    90     return;

    91   }

    93   MOZ_MTLOG(ML_DEBUG, LAYER_INFO << "OnSocketReady(flags=" << outflags << ")");

    95   unsigned char buf[1600];

    96   int32_t rv = PR_Read(fd, buf, sizeof(buf));

    98   if (rv > 0) {

    99     // Successful read

   100     MOZ_MTLOG(ML_DEBUG, LAYER_INFO << "Read " << rv << " bytes");

   101     SignalPacketReceived(this, buf, rv);

   102   } else if (rv == 0) {

   103     MOZ_MTLOG(ML_DEBUG, LAYER_INFO << "Read 0 bytes; channel closed");

   104     TL_SET_STATE(TS_CLOSED);

   105   } else {

   106     PRErrorCode err = PR_GetError();

   108     if (err != PR_WOULD_BLOCK_ERROR) {

   109       MOZ_MTLOG(ML_DEBUG, LAYER_INFO << "Read error; channel closed");

   110       TL_SET_STATE(TS_ERROR);

   111     }

   112   }

   113 }

   115 NS_IMPL_ISUPPORTS0(TransportLayerPrsock::SocketHandler)

   116 }  // close namespace

The Tor Browser / file revision

media/mtransport/transportlayerprsock.cpp@97036ab72558

media/mtransport/transportlayerprsock.cpp